Question 1

Which of the following best describes the concept of 'descent with modification' as proposed by Charles Darwin?

Accepted Answer

The process by which species accumulate differences from their ancestors as they adapt to different environments over time.

Question 2

A population of beetles is split by a river, and over thousands of years, the two groups evolve into distinct species. Which evolutionary process does this scenario best illustrate?

Accepted Answer

Allopatric speciation

Question 3

Which of the following is an example of a homologous structure?

Accepted Answer

The flippers of a whale and the arms of a human

Question 4

Which of the following statements about genetic drift is correct?

Accepted Answer

It can cause allele frequencies to fluctuate unpredictably from one generation to the next.

Question 5

A population of flowers experiences a flood that drastically reduces its size. The surviving population has different allele frequencies than the original. This is an example of:

Accepted Answer

Bottleneck effect

Question 6

Which of the following best explains why sickle-cell anemia persists in some human populations?

Accepted Answer

Heterozygotes have a selective advantage in regions where malaria is prevalent.

Question 7

Which of the following is a postzygotic reproductive barrier?

Accepted Answer

Hybrid sterility

Question 8

Which of the following groups is monophyletic?

Accepted Answer

A group that includes a common ancestor and all of its descendants

Question 9

Which principle is used to infer phylogenetic trees by selecting the simplest explanation consistent with the data?

Accepted Answer

Maximum parsimony

Question 10

Which of the following is NOT a source of genetic variation in populations?

Accepted Answer

Genetic drift

Question 11

Which of the following best describes the endosymbiont theory?

Accepted Answer

Mitochondria and plastids originated as prokaryotic cells engulfed by a host cell.

Question 12

Which of the following is an example of convergent evolution?

Accepted Answer

The similar body shapes of dolphins (mammals) and sharks (fish)

Question 13

Which of the following is a correct statement about radiometric dating?

Accepted Answer

It estimates the age of a fossil based on the decay of radioactive isotopes.

Question 14

Which of the following is a role that prokaryotes play in the biosphere?

Accepted Answer

Decomposers that recycle nutrients

Question 15

Which of the following best describes adaptive radiation?

Accepted Answer

A period of evolutionary change in which groups of organisms form many new species adapted to different ecological roles.

Question 16

Which of the following is a reason why natural selection cannot produce 'perfect' organisms?

Accepted Answer

Natural selection can only act on existing variations.

Question 17

A scientist is studying a group of organisms and finds that they all share a unique trait not found in their ancestors. This trait is best described as:

Accepted Answer

A shared derived character

Question 18

Which of the following best describes the difference between the biological species concept and the morphological species concept?

Accepted Answer

The biological species concept is based on the ability to interbreed and produce fertile offspring, while the morphological species concept is based on measurable anatomical criteria.

Question 19

Which of the following is an example of gene flow?

Accepted Answer

A population of birds migrates to a new area and breeds with the local population, introducing new alleles.

Question 20

Which of the following best explains why analogous structures arise in different species?

Accepted Answer

They result from convergent evolution due to similar environmental pressures.

Evolution, Phylogeny, and the Early History of Life: Study Guide (Chapters 19–25)

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